1 | // SPDX-License-Identifier: GPL-2.0 |
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2 | |
3 | #include <linux/kernel.h> |
4 | #include <linux/export.h> |
5 | #include <linux/property.h> |
6 | |
7 | #include <asm/mpc5xxx.h> |
8 | |
9 | /** |
10 | * mpc5xxx_fwnode_get_bus_frequency - Find the bus frequency for a firmware node |
11 | * @fwnode: firmware node |
12 | * |
13 | * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx), |
14 | * or 0 if the bus frequency cannot be found. |
15 | */ |
16 | unsigned long mpc5xxx_fwnode_get_bus_frequency(struct fwnode_handle *fwnode) |
17 | { |
18 | struct fwnode_handle *parent; |
19 | u32 bus_freq; |
20 | int ret; |
21 | |
22 | ret = fwnode_property_read_u32(fwnode, propname: "bus-frequency", val: &bus_freq); |
23 | if (!ret) |
24 | return bus_freq; |
25 | |
26 | fwnode_for_each_parent_node(fwnode, parent) { |
27 | ret = fwnode_property_read_u32(fwnode: parent, propname: "bus-frequency", val: &bus_freq); |
28 | if (!ret) { |
29 | fwnode_handle_put(fwnode: parent); |
30 | return bus_freq; |
31 | } |
32 | } |
33 | |
34 | return 0; |
35 | } |
36 | EXPORT_SYMBOL(mpc5xxx_fwnode_get_bus_frequency); |
37 |